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platform/x86: redmi-wmi: report EC state change events

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The Redmibook EC/firmware fully handles the keyboard backlight cycle,
the OEM preset power mode (Fn+K) and the Fn lock toggle by itself, and
sends a WMI event carrying the resulting state in the third payload
byte. These events are currently swallowed with KE_IGNORE, so userspace
never learns that the state changed and cannot give the user any
feedback (OSD), even though the WMI event is the only notification
channel for these EC-driven changes.

Report them as key presses instead:

  - keyboard backlight cycle -> KEY_KBDILLUMTOGGLE
  - OEM preset power mode    -> KEY_PERFORMANCE
  - Fn lock toggle           -> KEY_FN_ESC

Desktops that only look at the keycode get the usual hotkey behaviour;
since sparse-keymap emits MSC_SCAN with the raw payload before the key
event, an OSD daemon can additionally recover the exact new state from
byte 2 (e.g. backlight Off/Low/High/Auto is 0x00/0x05/0x0a/0x80).

Note that the power mode event must keep being read from the WMI device
in any case: on the TM2209 the ACPI event handler (EV20) applies the
mode change as a side effect of building the event payload for _WED.

Tested on Redmi Book Pro 15 2023 (TM2209).

Signed-off-by: Musaev Ibragim <atomicus.xyz@gmail.com>
Link: https://patch.msgid.link/178405473606.25865.4048095379503614221@gmail.com
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
This commit is contained in:
Musaev Ibragim
2026-07-15 00:45:36 +06:00
committed by Ilpo Järvinen
parent 08ce055a42
commit e0d6312578
1 changed files with 13 additions and 13 deletions
Download Patch File Download Diff File Expand all files Collapse all files

26
drivers/platform/x86/redmi-wmi.c
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@@ -29,24 +29,24 @@ static const struct key_entry redmi_wmi_keymap[] = {
{KE_KEY, 0x00011801, {KEY_ASSISTANT}},
{KE_KEY, 0x00011901, {KEY_ASSISTANT}},
/* Keyboard backlight */
{KE_IGNORE, 0x00000501, {}},
{KE_IGNORE, 0x00800501, {}},
{KE_IGNORE, 0x00050501, {}},
{KE_IGNORE, 0x000a0501, {}},
/* Keyboard backlight: Off / Auto / Low / High (new state in byte 2) */
{KE_KEY, 0x00000501, {KEY_KBDILLUMTOGGLE}},
{KE_KEY, 0x00800501, {KEY_KBDILLUMTOGGLE}},
{KE_KEY, 0x00050501, {KEY_KBDILLUMTOGGLE}},
{KE_KEY, 0x000a0501, {KEY_KBDILLUMTOGGLE}},
/* Xiaomi G Command Center */
{KE_KEY, 0x00010a01, {KEY_VENDOR}},
/* OEM preset power mode */
{KE_IGNORE, 0x00011601, {}},
{KE_IGNORE, 0x00021601, {}},
{KE_IGNORE, 0x00031601, {}},
{KE_IGNORE, 0x00041601, {}},
/* OEM preset power mode: 1=Balanced 2=Silent 3=Turbo 4=Full speed */
{KE_KEY, 0x00011601, {KEY_PERFORMANCE}},
{KE_KEY, 0x00021601, {KEY_PERFORMANCE}},
{KE_KEY, 0x00031601, {KEY_PERFORMANCE}},
{KE_KEY, 0x00041601, {KEY_PERFORMANCE}},
/* Fn Lock state */
{KE_IGNORE, 0x00000701, {}},
{KE_IGNORE, 0x00010701, {}},
/* Fn Lock state: 1=on 0=off */
{KE_KEY, 0x00000701, {KEY_FN_ESC}},
{KE_KEY, 0x00010701, {KEY_FN_ESC}},
/* Fn+`/1/2/3/4 */
{KE_KEY, 0x00011101, {KEY_F13}},